JP4183563B2 - Packaging bag for fruits and vegetables and package using the same - Google Patents
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- JP4183563B2 JP4183563B2 JP2003160373A JP2003160373A JP4183563B2 JP 4183563 B2 JP4183563 B2 JP 4183563B2 JP 2003160373 A JP2003160373 A JP 2003160373A JP 2003160373 A JP2003160373 A JP 2003160373A JP 4183563 B2 JP4183563 B2 JP 4183563B2
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Description
【０００１】
【発明の属する技術分野】
本発明は、鮮度も良く、見栄えの良い自立可能な青果物用の包装袋に関するものである。
【０００２】
【従来の技術】
近年青果物の販売において裸で売るよりもフィルム包装されつつある。単に包むだけでなく密封包装し、ＭＡ（Ｍｏｄｉｆｉｅｄ Ａｔｏｍｏｓｐｈｅｒｅ）効果を有する青果物鮮度保持資材が開発され、萎れ、変色、腐敗、異臭による鮮度低下を防止できるため主に流通用に使用されている。青果物の包装袋には鮮度保持という機能だけでなく、見栄えの良い機能も要望されている。包装袋には様々な形態があり自立可能な包装袋（スタンディングパウチ）もその1つである。従来の自立可能な包装袋のフィルムには、ポリエチレンテレフタレート、ナイロンまたは延伸ポリプロピレンにポリエチレンをラミネートした積層（複層）フィルムが主に使用されており、これらのフィルムは自立させるために厚みを５０μｍ以上に増やしてコシを持たせる必要があるが、コストが高くなることがネックであった。また今までの延伸ポリプロピレンでは、コストが安くコシは強いものの、自立可能な包装形態にするとシール強度が弱くて袋が破れ、内容物が飛び出てしまうことが多く、袋の見栄えが悪いばかりか密封包装できないため本発明の様な自立可能な包装袋は存在しなかった。
【０００３】
特開平２−２８３１１号公報では、２７０℃で溶断シールしたときに３．０ｋｇ−cm／15mm以上の溶断シール強度を示す複層フィルムを用いるとあるが、自立可能な包装袋に関するものではない。また青果物は軽量の物が大多数であり、シール強度は必ずしも３．０ｋｇ以上は必要としない。
【０００４】
実開平５−４２１４６号公報では、新鮮フルーツ用角袋として記載されているが、袋の開口部は開放されており、呼吸を抑制できずに鮮度は低下する。
また、素材が薄くてシール強度があり、シールからの漏れもない包装形態は今までなかった。この様に、鮮度保持可能で自立可能な包装袋は今までなかった。
【０００５】
【特許文献１】
特開平２−２８３１１号公報
【特許文献２】
実開平５−４２１４６号公報
【０００６】
【発明が解決しようとする課題】
本発明は従来得られなかった、内容物を良好に保ち、見栄えの良い自立可能な包装袋を提供することを目的とする。
【０００７】
【課題を解決するための手段】
すなわち本発明は、胴及び底からなる包装袋であり、胴材が厚み２８〜５５μｍのポリプロピレンフィルム又はポリエチレンフィルムの単独もしくは両者の組み合わせ、底材が厚み３５〜７５μｍのポリプロピレンフィルム又はポリエチレンフィルムの単独もしくは両者の組み合わせであり、自立可能な包装袋である青果物用の包装袋である。
【０００８】
更に好ましい形態としては、包装袋の胴の両サイドがヒートシールされており、又は包装袋の胴の両サイドが溶断シールされており、包装袋のヒートシール強度が３．９Ｎ／１５ｍｍ以上であり、包装袋の溶断シール強度が１９．６Ｎ／１５ｍｍ以上であり、フィルムに防曇剤、ヒートシール剤が付与されており、フィルムに、開孔面積６．５×１０-10〜３．０×１０-4ｍ2 の未貫通のキズ、微孔が少なくとも１つ以上設けられ、青果物を収納し開口部を密封包装した後の袋内の酸素濃度が大気中よりも低く、二酸化炭素濃度が高く、包装袋の開口部にジッパーが付いている青果物用の包装袋である。
また、上記の包装袋を用い、青果物を包装した包装体である。
【０００９】
【発明の実施の形態】
本発明に用いる素材は、胴材、底材ともポリプロピレンフィルム又はポリエチレンフィルムの何れかの単独か或いは両者を組み合わせたフィルムであり、ポリプロピレン樹脂同士の多層フィルム、ポリエチレン樹脂同士の多層フィルムでも良く、ポリエチレン樹脂としてエチレン酢酸ビニル共重合体、エチレンアクリル共重合体、エチレン−ポリビニルアルコール共重合体、アイオノマー等も含まれる。ポリプロピレンフィルムとしては、例えば、延伸ポリプロピレンフィルム、未延伸ポリプロピレンフィルムが使用でき、胴材と底材との材質、フィルムの厚みが異なっていても良い。例えば、胴材に延伸ポリプロピレンフィルム、底材にポリエチレンフィルムという組合せでも良い。ポリエチレンフィルムは透明性のある低密度ポリエチレンが好ましい。
【００１０】
胴材のフィルムの厚みは２８〜５５μｍが良く、好ましくは３０〜５０μｍである。２８μｍ未満ではコシがなく自立しにくく、５５μｍを超えるとコストが高くなる。また、フィルムの厚みが厚いと青果物用の鮮度保持に必要なガス透過量が不足し、キズ、微細孔の調整が難しくなる可能性がある。また底材のフィルムの厚みは３５μｍ〜１００μｍが良く、３５μｍ〜８０μｍがより好ましい。３５μｍ未満ではピンホールが発生しやすくなり、１００μｍを超えるとコストが高くなる。
【００１１】
包装袋は内面のシール強度が強くなければならない。包装袋の胴の両サイド（胴部同士）は、ヒートシール方法が一般的であるが、さらに包装する青果物の重量が重い場合にはよりシール強度が必要となり溶断シールを用いる。包装袋の胴部と底部とのシールも同様にヒートシール、溶断シールを用いる。なお、包装袋の胴の両サイドのシール方法と胴部／底部のシール方法とが異なっていても良い。
ヒートシールの場合には、３．９Ｎ／１５ｍｍ以上あることが好ましい。３．９Ｎ／１５ｍｍ未満の強度では、青果物を収納すると袋が破断する恐れがある。また、溶断シールの場合には、１９．６Ｎ／１５ｍｍ以上あることが好ましい。シール強度の測定方法は、ＪＩＳ Ｚ０２３８に準ずる。
【００１２】
延伸ポリプロピレンの場合、例えば、１２０〜１６０℃の熱シール板で荷重２ｋｇ、時間０．５秒でシールした時のシール強度は３．９Ｎ〜６．９Ｎである。シール温度は１２０℃より低いとシール強度が低すぎ、１６０℃を超えると温度が高過ぎエッジ切れやフィルムの溶融により仕上がりが汚くなる可能性がある。この程度の強度で図１の様な底ガゼットの包装袋の内面に使用すると重ねた部分のシール強度が弱く、内容物が飛び出したり、シール部分にピンホールが発生し空気漏れを引き起こし青果物用の鮮度保持に必要なガス透過量の調整が出来ずに品質不良の原因となる可能性がある。
【００１３】
ヒートシール、溶断シールとも通常のシール機を用いることができる。
シール強度をアップするためにはヒートシール層を厚くしても良いし、ヒートシール剤をグラビア印刷やロールコート印刷の様に後付け加工しても良い。また防曇性を出す為に延伸ポリプロピレンフィルムに予め防曇剤を練りこんでいても印刷加工時に表面に塗布しても何ら構わない。ヒートシール剤や防曇剤の組成には食品衛生上問題なければ何らの制限もない。
【００１４】
本包装袋に用いられる青果物の品目としては、スプラウトなどのもやし類、ハーブなどの葉菜類、アスパラガス、枝豆、ミニトマトなどの果菜類、ミカンなどの果実類、シイタケなどの菌茸類、しょうが、長ネギなどの根菜類、カットネギ、カットサラダなどのカット野菜などが用いられ制限は無い。内容量は内容物飛び出し防止のために１９．６Ｎ以下が望ましい。シール強度と内容物の重量は近い関係に有り、内容物の重量としてはシール強度以下の重量を収納するのが望ましい。全て溶断シールの場合、収納する青果物の重量は１９．６Ｎ以下が良いし、包装袋の一部がヒートシールしている場合は、例えばシール強度が４．９Ｎならばそれ以下の重量の青果物を収納すると良い。
【００１５】
青果物を収納後、青果物を収納した袋の開口部は密封する。密封する方法としては、ヒートシール、バッグシール、ジッパーなどどんな方法を用いても良く、それらを組み合わせても良い。また、底材と胴材のサイドの接合部に切欠き穴があっても良いし、開口部付近に、開封用の切れ込みを設けても構わない。
本発明に用いるジッパーについては、プラスチック製が屈曲性を有するので使い勝手が良く、材質は包装袋と接着可能で、断面の形状が凹凸で密閉可能なタイプであればスライダー付きでも無しでもどんなものでも構わない。
【００１６】
本包装袋のフィルムには、酸素などの透過量調節のため、キズ、微細孔などの処理が施されていることが好ましい。キズ、微細孔など開孔面積は６．５×１０-10〜３．０×１０-4ｍ2 が良い。６．５×１０-10未満であれば孔加工やガス調整が難しくなる可能性があり、３．０×１０-4ｍ2 を超えるとガス透過量が多すぎて調整が難しくなる可能性がある。また形状は、特に制限されず、フィルムを部分的に薄くする為のキズや円、長円、角など各種計上の穴でも良い。穴加工の方法は、例えばレーザー、熱針などを用いて穴をあけることができ、その方法は特に限定されず、公知の方法を用いることが出来る。また、シールで塞がない位置ならば胴材、底材どちらに加工を施しても構わない。
フィルムの厚さによりガス透過性を調整することも出来るが、様々な種類の品種、温度帯で呼吸の異なる青果物に合せる為には、キズや微細孔などがある方が好ましい。青果物の呼吸を抑制するために、袋内の酸素濃度が大気中よりも低く、二酸化炭素濃度が高くなるように適度なガス透過性を有することが好ましい。
本発明の包装体は、前述の包装袋を用いて青果物を包装したものであり、青果物を収納した後、包装袋の開口部はヒートシールなどで封をされたものであるが、包装体を作製する包装方法などは公知の方法を用いることができる。
【００１７】
【実施例】
《実施例１》
胴材を厚さ３０μｍの防曇処理した二軸延伸ポリプロピレン、底材を厚さ４０μｍのポリエチレンで図１の様にサイドを溶断シール、底材と胴材の接合部を５ｍｍ巾でヒートシールした折込み深さ３０ｍｍ、内寸横１５０×縦２３０ｍｍの包装袋を作成し、枝豆２００ｇを入れ開口部をヒートシールした。自立性、ピンホールの有無を表１に示す。シール強度を表２に示す。なお、ピンホールの確認は、全てサイドシールにおける胴材と底材が重なった部分のピンホールの有無を確認したが、以下の実施例も同様である。
《実施例２》
胴材を厚さ４０μｍの防曇処理した二軸延伸ポリプロピレン、底材を厚さ５０μｍの未延伸ポリプロピレンで図２の様にサイドを溶断シール、底材と胴材の接合部を溶断シールした折込み深さ３０ｍｍ、内寸横１５０×縦２３０ｍｍの包装袋を作成し、ミニトマト２００ｇを入れ開口部をヒートシールした。自立性、ピンホールの有無を表１に示す。シール強度を表２に示す。
《実施例３》
胴材を厚さ５０μｍの防曇処理した未延伸ポリプロピレン、底材を厚さ９０μｍの未延伸ポリプロピレンで図３の様にサイドを５ｍｍ巾でヒートシール、底材と胴材の接合部を５ｍｍ巾でヒートシールした折込み深さ３０ｍｍ、内寸横１５０×縦２３０ｍｍの包装袋を作成し、シイタケ２００ｇを入れ開口部をヒートシールした。自立性、ピンホールの有無を表１に示す。シール強度を表２に示す。
【００１８】
《実施例４》
胴材を厚さ３０μｍの防曇処理した未延伸ポリプロピレン、底材を厚さ６０μｍの未延伸ポリプロピレンで図４の様にサイドを５ｍｍ巾でヒートシール、底材と胴材の接合部を溶断シールした折込み深さ３０ｍｍ、内寸横１５０×縦２３０ｍｍの包装袋を作成し、ブロッコリースプラウト１００ｇを入れ開口部をヒートシールした。自立性、ピンホールの有無を表１に示す。シール強度を表２に示す。
《実施例５》
胴材を厚さ４０μｍの防曇処理したポリエチレン、底材を厚さ８０μｍの二軸延伸ポリプロピレンで図３の様にサイドを溶断シール、底材と胴材の接合部をヒートシールした折込み深さ３０ｍｍ、内寸横１５０×縦２３０ｍｍの包装袋を作成し、ブロッコリースプラウト１００ｇを入れ開口部をヒートシールした。自立性、ピンホールの有無を表１に示す。シール強度を表２に示す。
《参考例１》
胴材、底材とも厚さ４０μｍの防曇処理した二軸延伸ポリプロピレンを用い、図５の様にサイドを溶断シール、底材と胴材の接合部をＵ字状にヒートシールした、折込み深さ３０ｍｍ、開口部より３０ｍｍの位置にジッパーを設けて内寸横１５０×縦２３０ｍｍの包装袋を作成し、温州ミカン４個を入れ開口部をジッパーで留めた。自立性、ピンホールの有無を表１に示す。シール強度を表２に示す。
【００１９】
《参考例２》
胴材、底材とも厚さ５０μｍの防曇処理したポリエチレンで、図１の様にサイドを溶断シール、底材と胴材の接合部を５ｍｍ巾でヒートシールした、折込み深さ３０ｍｍ、横１５０×縦２３０ｍｍの包装袋を作成し、生姜１５０ｇを入れ開口部をヒートシールした。自立性、ピンホールの有無を表１に示す。シール強度を表２に示す。
【００２０】
《比較例１》
胴材を厚さ２５μｍの防曇処理した低密度ポリエチレン、底材を厚さ３０μｍの低密度ポリエチレンで図１の様にサイドを溶断シール、底材と胴材の接合部を５ｍｍ巾でヒートシールした折込み深さ３０ｍｍ、内寸横１５０×縦２３０ｍｍの包装袋を作成し、枝豆２００ｇを入れ開口部をヒートシールした。自立性、ピンホールの有無を表１に示す。シール強度を表２に示す。
《比較例２》
胴材を厚さ２０μｍの防曇処理した未延伸ポリプロピレン、底材を厚さ１１０μｍの未延伸ポリプロピレンで図２の様にサイドを溶断シール、底材と胴材の接合部を溶断シールした折込み深さ３０ｍｍ、内寸横１５０×縦２３０ｍｍの包装袋を作成し、ミニトマト２００ｇを入れ開口部をヒートシールした。自立性、ピンホールの有無を表１に示す。シール強度を表２に示す。
《比較例３》
胴材を厚さ２５μｍの防曇処理した二軸延伸ポリプロレン、底材を厚さ３０μｍの二軸延伸ポリプロレンで図３の様にサイドを５ｍｍ巾でヒートシール、底材と胴材の接合部を５ｍｍ巾でヒートシールした折込み深さ３０ｍｍ、内寸横１５０×縦２３０ｍｍの包装袋を作成し、シイタケ２００ｇを入れ開口部をヒートシールした。自立性、ピンホールの有無を表１に示す。シール強度を表２に示す。
【００２１】
《実施例８》
実施例１と同じ構成、サイズの包装袋に開孔面積２．８×１０-9ｍ2の穴を４５個設け、枝豆２００ｇを入れ開口部をヒートシールした。２０℃の保存性を表３に示す。
《実施例９》
実施例４と同じ構成で折込み深さ５０ｍｍ、内寸横３００×縦２５０ｍｍの包装袋に開孔面積７．９×１０-7ｍ2の穴を１個設け、カットネギ１０００ｇを入れ開口部をヒートシールした。１０℃の保存性を表３に示す。
【００２２】
《実施例１０》
実施例５と同じ構成、サイズの包装袋に開孔面積６.４×１０-9ｍ2の穴を１０個設け、ブロッコリースプラウト１００ｇを入れ開口部をヒートシールした。１０℃の保存性を表３に示す。
《参考例３》
参考例１と同じ構成、サイズの包装袋に開孔面積７．９×１０-9ｍ2の穴を３０個設け、温州ミカン４個を入れ開口部をジッパーで留めた。２０℃の保存性を表３に示す。
【００２３】
《比較例４》
胴材を厚さ６０μｍの防曇処理した二軸延伸ポリプロピレン、底材を厚さ４０μｍのポリエチレンで図１の様にサイドを溶断シール、底材と胴材の接合部を５ｍｍ巾でヒートシールした折込み深さ３０ｍｍ、内寸横１５０×縦２３０ｍｍの透過量調整用のキズ、貫通孔を設けずに包装袋を作成し、枝豆２００ｇを入れ開口部をヒートシールした。２０℃の保存性を表３に示す。自立性は問題なかったが、実施例１のフィルムと比較してコストが約１．５倍と高くなった。
【００２４】
【表１】
【表２】
【表３】
【発明の効果】
本発明の包装袋を用いると、従来得られなかった、低コストで見栄えの良い自立可能な青果物用の包装袋を提供でき、更に袋の内容物の鮮度を良好に保つことができる包装袋を提供することができる。
【図面の簡単な説明】
【図１】本発明の包装袋の一例で、胴部同士（両サイド）が溶断シールされ、胴部と底部とがヒートシールされ、底部が折りこまれている状況を示す。
【図２】本発明の包装袋の一例で、胴部同士（両サイド）が溶断シールされ、胴部と底部とが溶断シールされ、底部が折りこまれている状況を示す。
【図３】本発明の包装袋の一例で、胴部同士（両サイド）がヒートシールされ、胴部と底部とがヒートシールされ、底部が折りこまれている状況を示す。
【図４】本発明の包装袋の一例で、胴部同士（両サイド）がヒートシールされ、胴部と底部とが溶断シールされ、底部が折りこまれている状況を示す。
【図５】本発明の包装袋の一例で、開口部にジッパーを有し、胴部同士（両サイド）が溶断シールされ、胴部と底部とがU字状にヒートシールされ、底部が折りこまれている状況を示す。
【図６】本発明の包装袋の一例で、図2の包装袋の開口部を開き、自立させた状況を示す。
【図７】本発明の包装袋の一例で、図６を下側からみた状況を示す。
【図８】本発明の包装袋の一例で、図４の包装袋に切り欠き穴、開封用切れ込みを設けたものを示す。
【符号の説明】
１：胴材
２：底材
３：ヒートシール部
４：ジッパー
５：切り欠き穴
６：開封用切れ込み[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a self-supporting packaging bag for fruits and vegetables having good freshness and good appearance.
[0002]
[Prior art]
In recent years, in the sale of fruits and vegetables, film packaging is becoming more popular than selling naked. A fruit and vegetables freshness-keeping material that has not only been wrapped but also hermetically wrapped and has an MA (Modified Atmosphere) effect has been developed, and is used mainly for distribution because it can prevent deterioration of freshness due to wilting, discoloration, decay, and offensive odor. In addition to the function of maintaining freshness, the packaging bag for fruits and vegetables is also required to have a good-looking function. There are various types of packaging bags, and one of them is a standing bag. Conventional self-supporting packaging bag films mainly use polyethylene terephthalate, nylon, or laminated polypropylene (multilayer) films laminated with polyethylene. These films have a thickness of 50 μm or more to be self-supporting. However, it is necessary to increase the cost, but the cost is high. In addition, with conventional polypropylene, the cost is low and the stiffness is strong. However, if the packaging form is self-supporting, the sealing strength is weak, the bag is torn and the contents often pop out, and the bag looks bad and is sealed. Since packaging is impossible, there is no self-supporting packaging bag as in the present invention.
[0003]
In Japanese Patent Laid-Open No. 2-28311, a multilayer film showing a fusing seal strength of 3.0 kg-cm / 15 mm or more when fusing sealed at 270 ° C. is used, but it is not related to a self-supporting packaging bag. The fruits and vegetables are mostly lightweight, and the sealing strength does not necessarily need to be 3.0 kg or more.
[0004]
In Japanese Utility Model Laid-Open No. 5-42146, it is described as a square bag for fresh fruit, but the opening of the bag is open, and breathing cannot be suppressed, resulting in a decrease in freshness.
Moreover, there has never been a packaging form in which the material is thin, has a sealing strength, and does not leak from the seal. Thus, there has never been a packaging bag that can maintain its freshness and can stand on its own.
[0005]
[Patent Document 1]
JP-A-2-28311 [Patent Document 2]
Japanese Utility Model Publication No. 5-42146 [0006]
[Problems to be solved by the invention]
An object of the present invention is to provide a self-supporting packaging bag that is not obtained in the past and that keeps the contents good and looks good.
[0007]
[Means for Solving the Problems]
That is, this invention is a packaging bag which consists of a trunk | drum and a bottom, the body material is a 28-55 micrometer-thick polypropylene film or a polyethylene film, or a combination of both, and a bottom material is a single-layer polypropylene film or a polyethylene film 35-75 micrometers in thickness. Or it is the combination bag of both, and it is a packaging bag for fruits and vegetables which is a packaging bag that can stand by itself.
[0008]
As a more preferable form, both sides of the body of the packaging bag are heat sealed, or both sides of the body of the packaging bag are fused and sealed, and the heat seal strength of the packaging bag is 3.9 N / 15 mm or more. The fusing seal strength of the packaging bag is 19.6 N / 15 mm or more, the film is provided with an antifogging agent and a heat sealant, and the film has an opening area of 6.5 × 10 −10 to 3.0 ×. 10 −4 m 2 unpenetrated scratches and at least one micropore provided, the oxygen concentration in the bag after storing fruits and vegetables and sealing the opening is lower than in the atmosphere, and the carbon dioxide concentration is higher A packaging bag for fruits and vegetables with a zipper at the opening of the packaging bag.
Moreover, it is the package which packaged vegetables and fruits using said packaging bag.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
The material used in the present invention is either a polypropylene film or a polyethylene film for both the body and bottom material, or a combination of both, and may be a multilayer film of polypropylene resins or a multilayer film of polyethylene resins. Examples of the resin include an ethylene vinyl acetate copolymer, an ethylene acrylic copolymer, an ethylene-polyvinyl alcohol copolymer, and an ionomer. As the polypropylene film, for example, a stretched polypropylene film or an unstretched polypropylene film can be used, and the material of the body and the bottom material and the thickness of the film may be different. For example, a combination of a stretched polypropylene film for the body and a polyethylene film for the bottom may be used. The polyethylene film is preferably transparent low density polyethylene.
[0010]
The thickness of the film of the body is preferably 28 to 55 μm, and preferably 30 to 50 μm. If it is less than 28 μm, there is no stiffness and it is difficult to stand by itself, and if it exceeds 55 μm, the cost increases. In addition, if the film is thick, the amount of gas permeation necessary for maintaining freshness for fruits and vegetables is insufficient, and it may be difficult to adjust scratches and fine holes. The thickness of the bottom film is preferably 35 μm to 100 μm, and more preferably 35 μm to 80 μm. If it is less than 35 μm, pinholes are likely to occur, and if it exceeds 100 μm, the cost increases.
[0011]
The packaging bag must have a strong inner seal strength. A heat seal method is generally used for both sides (body portions) of the body of the packaging bag. However, when the weight of the fruits and vegetables to be packaged is heavy, a sealing strength is required and a fusing seal is used. Similarly, a heat seal and a fusing seal are used for sealing the body and bottom of the packaging bag. The sealing method on both sides of the body of the packaging bag and the sealing method on the body / bottom may be different.
In the case of heat sealing, it is preferably 3.9 N / 15 mm or more. If the strength is less than 3.9 N / 15 mm, the bag may be broken when the fruits and vegetables are stored. In the case of a fusing seal, it is preferably 19.6 N / 15 mm or more. The method for measuring the seal strength is in accordance with JIS Z0238.
[0012]
In the case of stretched polypropylene, for example, the sealing strength is 3.9 N to 6.9 N when sealed with a heat seal plate at 120 to 160 ° C. with a load of 2 kg and a time of 0.5 seconds. If the sealing temperature is lower than 120 ° C., the sealing strength is too low, and if it exceeds 160 ° C., the temperature is too high, and the finish may become dirty due to edge cutting or melting of the film. When used on the inner surface of the bottom gusseted packaging bag as shown in Fig. 1 with this level of strength, the seal strength of the overlapped part is weak, the contents pop out, pinholes are generated in the seal part, causing air leakage and for fruits and vegetables The amount of gas permeation necessary for maintaining freshness cannot be adjusted, which may cause quality defects.
[0013]
A normal sealing machine can be used for both heat sealing and fusing sealing.
In order to increase the sealing strength, the heat seal layer may be thickened, or the heat seal agent may be post-processed like gravure printing or roll coat printing. Moreover, in order to give antifogging property, an antifogging agent may be kneaded into the stretched polypropylene film in advance or applied to the surface during printing. There are no restrictions on the composition of the heat sealant or antifogging agent as long as there is no problem in food hygiene.
[0014]
Fruits and vegetables used in this packaging bag include sprout and other bean sprouts, herb and other leafy vegetables, asparagus, green soybeans and cherry tomatoes and other fruits, mandarin and other fruits, shiitake and other fungi and ginger. Root vegetables such as long leek, cut vegetables such as cut leek and cut salad are used, and there is no limit. The content is preferably 19.6 N or less to prevent the contents from popping out. There is a close relationship between the seal strength and the weight of the contents, and it is desirable that the weight of the contents is less than the seal strength. In the case of all the fusing seals, the weight of the fruits and vegetables to be stored should be 19.6N or less, and when a part of the packaging bag is heat-sealed, for example, if the seal strength is 4.9N, the weight of the fruits and vegetables should be less than that. It is good to store.
[0015]
After storing the fruits and vegetables, the opening of the bag containing the fruits and vegetables is sealed. As a sealing method, any method such as heat sealing, bag sealing, and zipper may be used, and these may be combined. Moreover, a notch hole may be provided in the joint portion between the bottom material and the body material, and a notch for opening may be provided in the vicinity of the opening.
The zipper used in the present invention is easy to use because plastic is flexible, and the material can be bonded to the packaging bag, and the cross-sectional shape is uneven and can be sealed with or without a slider. I do not care.
[0016]
The film of the packaging bag is preferably subjected to treatment such as scratches and micropores in order to adjust the permeation amount of oxygen and the like. The opening area such as scratches and fine holes is preferably 6.5 × 10 −10 to 3.0 × 10 −4 m 2 . If it is less than 6.5 × 10 −10 , drilling and gas adjustment may be difficult, and if it exceeds 3.0 × 10 −4 m 2 , there may be too much gas permeation and adjustment may be difficult. is there. Further, the shape is not particularly limited, and various holes such as scratches, circles, ellipses and corners for partially thinning the film may be used. For example, a hole processing method can be used to form a hole using a laser, a hot needle, or the like, and the method is not particularly limited, and a known method can be used. Further, as long as the position is not blocked by the seal, either the body material or the bottom material may be processed.
Although the gas permeability can be adjusted by the thickness of the film, it is preferable to have scratches, fine holes, etc. in order to match various types of varieties and fruits and vegetables with different breathing in the temperature range. In order to suppress the respiration of fruits and vegetables, it is preferable that the oxygen concentration in the bag is lower than that in the air and the gas permeability is moderate so that the carbon dioxide concentration is high.
The package of the present invention is a product in which fruits and vegetables are packaged using the above-described packaging bag, and after storing the fruits and vegetables, the opening of the packaging bag is sealed by heat sealing or the like. A well-known method can be used for the packaging method etc. to produce.
[0017]
【Example】
Example 1
Biaxially-stretched polypropylene with anti-fogging treatment with a thickness of 30 μm for the body, polyethylene with a thickness of 40 μm for the bottom, and fusing and sealing the sides as shown in FIG. 1, and heat-sealing the joint between the bottom and the body with a width of 5 mm. A packaging bag having a folding depth of 30 mm and an inner dimension of 150 × 230 mm was prepared, and 200 g of green soybeans were added to heat-seal the opening. Table 1 shows the independence and the presence or absence of pinholes. Table 2 shows the seal strength. It should be noted that all pinholes were checked for the presence or absence of pinholes in the side seals where the body and bottom material overlapped, but the same applies to the following examples.
Example 2
A biaxially stretched polypropylene with anti-fogging treatment with a thickness of 40 μm on the body, an unstretched polypropylene with a thickness of 50 μm on the bottom, and a melt-sealed side seal as shown in FIG. A packaging bag having a depth of 30 mm and an inner size of 150 × 230 mm was prepared, 200 g of cherry tomato was added, and the opening was heat sealed. Table 1 shows the independence and the presence or absence of pinholes. Table 2 shows the seal strength.
Example 3
The body is unstretched polypropylene with anti-fogging treatment with a thickness of 50 μm, the bottom material is unstretched polypropylene with a thickness of 90 μm, and the side is heat-sealed with a width of 5 mm as shown in FIG. A wrapping bag having a folding depth of 30 mm and an inner size of 150 × 230 mm was created by heat sealing at 200 mm, and 200 g of shiitake mushroom was added to heat-seal the opening. Table 1 shows the independence and the presence or absence of pinholes. Table 2 shows the seal strength.
[0018]
Example 4
Unstretched polypropylene with anti-fogging treatment with a thickness of 30 μm for the body, unstretched polypropylene with a thickness of 60 μm for the bottom material, heat-sealed with a side width of 5 mm as shown in FIG. A wrapping bag having a folding depth of 30 mm and an inner dimension of 150 × longitudinal 230 mm was prepared, and 100 g of broccoli sprout was added and the opening was heat sealed. Table 1 shows the independence and the presence or absence of pinholes. Table 2 shows the seal strength.
Example 5
Folding depth with 40 μm thick anti-fog treated polyethylene for base material, 80 μm thick biaxially oriented polypropylene for bottom material and fusing and sealing the sides as shown in FIG. A packaging bag having a size of 30 mm and a width of 150 mm and a length of 230 mm was prepared, and 100 g of broccoli sprout was placed and the opening was heat sealed. Table 1 shows the independence and the presence or absence of pinholes. Table 2 shows the seal strength.
<< Reference Example 1 >>
Folding depth using biaxially stretched polypropylene with anti-fogging treatment with a thickness of 40μm for both the body and bottom material, fusing and sealing the sides as shown in Fig. 5, and heat-sealing the joint between the bottom and body materials in a U shape A zipper was provided at a position of 30 mm in length and 30 mm from the opening to produce a packaging bag having an inner size of 150 × 230 mm in length, and four Wenzhou mandarin oranges were placed and the opening was fastened with a zipper. Table 1 shows the independence and the presence or absence of pinholes. Table 2 shows the seal strength.
[0019]
<< Reference Example 2 >>
The fuselage and bottom material are both 50 μm thick anti-fog-treated polyethylene, and the sides are fused and sealed as shown in FIG. 1, and the bottom and body joints are heat-sealed with a width of 5 mm. X A 230 mm long packaging bag was prepared, 150 g of ginger was added, and the opening was heat sealed. Table 1 shows the independence and the presence or absence of pinholes. Table 2 shows the seal strength.
[0020]
<< Comparative Example 1 >>
Low-density polyethylene with anti-fogging treatment with a thickness of 25μm for the body, low-density polyethylene with a thickness of 30μm for the bottom material, fusing and sealing the sides as shown in Fig. 1, and heat-sealing the joint between the bottom and the body with a width of 5mm A wrapping bag having a folding depth of 30 mm and an inner dimension of 150 × 230 mm was prepared, and 200 g of green soybeans were added and the opening was heat sealed. Table 1 shows the independence and the presence or absence of pinholes. Table 2 shows the seal strength.
<< Comparative Example 2 >>
Folding depth in which the body is unstretched polypropylene with anti-fogging treatment with a thickness of 20 μm, the bottom material is unstretched polypropylene with a thickness of 110 μm, and the sides are fused and sealed as shown in FIG. A packaging bag having a length of 30 mm and a width of 150 mm and a length of 230 mm was prepared. Table 1 shows the independence and the presence or absence of pinholes. Table 2 shows the seal strength.
<< Comparative Example 3 >>
Biaxially stretched polyprolene with anti-fogging treatment with a thickness of 25 μm on the body and biaxially stretched polyprolene with a thickness of 30 μm on the bottom, heat-sealed with a width of 5 mm as shown in FIG. 3, and the joint between the bottom and the body A packaging bag having a folding depth of 30 mm and an inner dimension of 150 × 230 mm was heat-sealed with a width of 5 mm, and 200 g of shiitake was added to heat-seal the opening. Table 1 shows the independence and the presence or absence of pinholes. Table 2 shows the seal strength.
[0021]
Example 8
Forty-five holes with an opening area of 2.8 × 10 −9 m 2 were provided in a packaging bag having the same configuration and size as in Example 1, 200 g of green soybeans were added, and the opening was heat sealed. Table 3 shows the storage stability at 20 ° C.
Example 9
In the same configuration as in Example 4, a hole with an opening area of 7.9 × 10 −7 m 2 is provided in a packaging bag having a folding depth of 50 mm, an inner dimension of 300 × 250 mm, and a cut green onion of 1000 g is put therein and the opening is heated. Sealed. Table 3 shows the storage stability at 10 ° C.
[0022]
Example 10
Ten holes having an opening area of 6.4 × 10 −9 m 2 were provided in a packaging bag having the same configuration and size as in Example 5, 100 g of broccoli sprout was placed, and the opening was heat sealed. Table 3 shows the storage stability at 10 ° C.
<< Reference Example 3 >>
Thirty holes with an opening area of 7.9 × 10 −9 m 2 were provided in a packaging bag having the same configuration and size as in Reference Example 1 , four Satsuma mandarin oranges were placed, and the opening was fastened with a zipper. Table 3 shows the storage stability at 20 ° C.
[0023]
<< Comparative Example 4 >>
Biaxially stretched polypropylene with anti-fogging treatment with a thickness of 60 μm for the base material, polyethylene with a thickness of 40 μm for the bottom material, fusing and sealing the sides as shown in FIG. 1, and heat-sealing the joint between the base material and the base material with a width of 5 mm. A packaging bag was prepared without providing a crack for adjusting the amount of permeation with a folding depth of 30 mm, an inner dimension of 150 × longitudinal 230 mm, and a through-hole, and 200 g of green soybeans were placed and the opening was heat sealed. Table 3 shows the storage stability at 20 ° C. Independence was not a problem, but the cost was about 1.5 times higher than the film of Example 1.
[0024]
[Table 1]
[Table 2]
[Table 3]
【The invention's effect】
When the packaging bag of the present invention is used, a packaging bag for fruits and vegetables that has not been obtained in the past and can be self-supported with good appearance can be provided, and furthermore, the packaging bag that can keep the freshness of the contents of the bag well. Can be provided.
[Brief description of the drawings]
FIG. 1 is an example of a packaging bag according to the present invention, and shows a situation in which body parts (both sides) are fused and sealed, a body part and a bottom part are heat sealed, and a bottom part is folded.
FIG. 2 shows an example of a packaging bag according to the present invention in which the body parts (both sides) are fused and sealed, the body part and the bottom part are fused and sealed, and the bottom part is folded.
FIG. 3 shows an example of a packaging bag according to the present invention in which the body parts (both sides) are heat sealed, the body part and the bottom part are heat sealed, and the bottom part is folded.
FIG. 4 shows an example of a packaging bag according to the present invention in which the body parts (both sides) are heat sealed, the body part and the bottom part are fused and sealed, and the bottom part is folded.
FIG. 5 shows an example of a packaging bag according to the present invention, which has a zipper at the opening, the body parts (both sides) are fused and sealed, the body part and the bottom part are heat-sealed in a U shape, and the bottom part is folded. Shows the situation.
6 shows an example of the packaging bag of the present invention, in which the opening of the packaging bag of FIG.
FIG. 7 shows an example of the packaging bag of the present invention, and shows the situation when FIG. 6 is viewed from below.
8 shows an example of the packaging bag of the present invention, in which the packaging bag of FIG. 4 is provided with a cutout hole and an opening notch.
[Explanation of symbols]
1: Body material 2: Bottom material 3: Heat seal part 4: Zipper 5: Notch hole 6: Cut for opening
Claims (9)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| JP2003160373A JP4183563B2 (en) | 2003-03-27 | 2003-06-05 | Packaging bag for fruits and vegetables and package using the same |
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| JP2003086814 | 2003-03-27 | ||
| JP2003160373A JP4183563B2 (en) | 2003-03-27 | 2003-06-05 | Packaging bag for fruits and vegetables and package using the same |
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| JP4183563B2 true JP4183563B2 (en) | 2008-11-19 |
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Cited By (2)
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| JP2009184277A (en) * | 2008-02-08 | 2009-08-20 | Horie Honten:Kk | Package bag production process and package bag produced thereby |
| JP2023062340A (en) * | 2021-10-21 | 2023-05-08 | マルシン商事株式会社 | Garden stuff packaging bag and manufacturing method of the same |
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| CN1318279C (en) * | 2004-12-23 | 2007-05-30 | 周鸣谦 | Fruit and vegetable can with soft package and its production process |
| JP4876473B2 (en) * | 2005-08-04 | 2012-02-15 | 住友ベークライト株式会社 | Packaging bag |
| JP5361784B2 (en) * | 2010-04-15 | 2013-12-04 | 日本マテリアル株式会社 | Method for protecting metallic calcium and protected metallic calcium |
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| JP2015189127A (en) * | 2014-03-28 | 2015-11-02 | 住友ベークライト株式会社 | Multilayer film for fusion cutting in bag making, packaging bag, and manufacturing method of multilayer film for fusion cutting in bag making |
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| JPH06199385A (en) * | 1992-10-21 | 1994-07-19 | Sumitomo Bakelite Co Ltd | Preservative bag for fruit and vegetable |
| JP4385443B2 (en) * | 1999-08-11 | 2009-12-16 | 東洋紡績株式会社 | Packaging film and package |
| JP2002128169A (en) * | 2000-10-27 | 2002-05-09 | Sumitomo Bakelite Co Ltd | Packaging method for broad beans |
| JP2002264915A (en) * | 2001-03-07 | 2002-09-18 | Dainippon Ink & Chem Inc | Method of packaging article in bag form |
| JP2002370752A (en) * | 2001-04-09 | 2002-12-24 | O-Cello:Kk | Food packaging container |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009184277A (en) * | 2008-02-08 | 2009-08-20 | Horie Honten:Kk | Package bag production process and package bag produced thereby |
| JP2023062340A (en) * | 2021-10-21 | 2023-05-08 | マルシン商事株式会社 | Garden stuff packaging bag and manufacturing method of the same |
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